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Amplifier Design and Modeling
Doug Bouler: CURENT REU
Dr. Daniel Costinett: Mentor
Final CURENT Presentation
7/18/2014
Knoxville, TN
Outline
2
1. Research goals2. Process
• Class A Amplification• Class AB Amplification• Model and Transfer Characteristic
3. Results 4. Future Work
Research Goals
3
• Design and Model a Class AB amplifier using LT-spice and MATLAB
• Make Class AB amplifier capable of amplifying an audio signal
• Test Magnitude and Phase Response
Class A Amplifiers
4
Vgate-source = Vrail x (R2 / R1 + R2)
R1/R2 = (Vrail - Vgs ) / Vgs
Input Signal
Voltage Rail
Output Signal
Vgs
Class A Amplifiers
5
Data of DC Analysis from 0V to 3V DC to find midpoint of slope
Optimal Vgs
Input Signal
Output Signal
VGS
VDD
Cutoff Region
Class A Amplifiers
6
Vgate-source = Vrail x (R2 / R1 + R2)
Vgate-source = Vrail x (R2 / R1 + R2)
Voltage Loss
Class AB Amplifiers
7
Class A
Class AB
Matching Transistors
Class AB Amplifiers
8
Matching Transistors
Class B Output Stage
Class AB Output Stage
Modeling Process
9
Collect Data from Output of Amplifier Stage
Normalize Data in MATLAB
Graph Input and Output
Voltage Response
Develop Transfer
Characteristic
Model Audio Response
Results
10
This figure shows the frequencies at which the magnitude of the output signal begins to attenuate
4000 Hz
Results
11
• η = Pout / Pin = 44.64%
• A = Vout / Vin = 40 V/V
Future Work
12
• Research methods of Wireless Power Transfer (WPT)
• Research Specific Absorption Rates (SAR) of WPT for Biomedical applications
• Use knowledge gained from this project to begin designing devices capable of WPT
“This work was supported primarily by the Engineering Research Center
Program of the National Science Foundation and the Department of Energy
under NSF Award Number EEC-1041877 and the CURENT Industry Partnership
Program. "
13
Acknowledgements